implemented highlighting of the grid via button.

Project_Periodensystem.View/MainWindow.axaml.cs

@@ -19,7 +19,7 @@ namespace Project_Periodensystem.View
             InitializeComponent();
             mainContent = this.FindControl<ContentControl>("MainContent");
             
-            // Erstelle Navigation Service
+            // Erstelle Navigation Service mit this (MainWindow)
             _navigationService = new NavigationService(this);
             
             // Controller mit Navigation Service initialisieren (Dependency Injection)

Project_Periodensystem.View/NavigationService.cs

@@ -14,13 +14,13 @@ namespace Project_Periodensystem.View
     /// </summary>
     public class NavigationService : INavigationService
     {
-        private readonly Window _mainWindow;
+        private readonly MainWindow _mainWindow;
         private PeriodensystemController? _dataController;
 
         /// <summary>
         /// Konstruktor
         /// </summary>
-        public NavigationService(Window mainWindow)
+        public NavigationService(MainWindow mainWindow)
         {
             _mainWindow = mainWindow ?? throw new ArgumentNullException(nameof(mainWindow));
             Logger.Log("NavigationService initialisiert - saubere Interface-Trennung");
@@ -50,8 +50,16 @@ namespace Project_Periodensystem.View
                 var periodicTablePage = new PeriodicTablePage();
                 periodicTablePage.SetController(_dataController);
                 
-                _mainWindow.Content = periodicTablePage;
+                var mainContent = _mainWindow.FindControl<ContentControl>("MainContent");
-                Logger.Log("NavigationService: Navigation zum Periodensystem");
+                if (mainContent != null)
+                {
+                    mainContent.Content = periodicTablePage;
+                    Logger.Log("NavigationService: Navigation zum Periodensystem");
+                }
+                else
+                {
+                    Logger.LogError("MainContent Control nicht gefunden");
+                }
             }
             catch (Exception ex)
             {
@@ -75,8 +83,16 @@ namespace Project_Periodensystem.View
                 var aboutPage = new AboutPage();
                 aboutPage.SetController(_dataController);
                 
-                _mainWindow.Content = aboutPage;
+                var mainContent = _mainWindow.FindControl<ContentControl>("MainContent");
-                Logger.Log("NavigationService: Navigation zu About");
+                if (mainContent != null)
+                {
+                    mainContent.Content = aboutPage;
+                    Logger.Log("NavigationService: Navigation zu About");
+                }
+                else
+                {
+                    Logger.LogError("MainContent Control nicht gefunden");
+                }
             }
             catch (Exception ex)
             {
@@ -100,8 +116,16 @@ namespace Project_Periodensystem.View
                 var landingPage = new LandingPage();
                 landingPage.SetController(_dataController);
                 
-                _mainWindow.Content = landingPage;
+                var mainContent = _mainWindow.FindControl<ContentControl>("MainContent");
-                Logger.Log("NavigationService: Navigation zur Landing Page");
+                if (mainContent != null)
+                {
+                    mainContent.Content = landingPage;
+                    Logger.Log("NavigationService: Navigation zur Landing Page");
+                }
+                else
+                {
+                    Logger.LogError("MainContent Control nicht gefunden");
+                }
             }
             catch (Exception ex)
             {

Project_Periodensystem.View/PeriodicTablePage.axaml

@@ -43,6 +43,12 @@
             <Setter Property="Margin" Value="2"/>
         </Style>
 
+        <!-- Highlighted element tile style -->
+        <Style Selector="Button.ElementTile.Highlighted">
+            <Setter Property="BorderBrush" Value="Yellow"/>
+            <Setter Property="BorderThickness" Value="4"/>
+        </Style>
+
         <!-- Specific styles for element tile content -->
         <Style Selector="Button.ElementTile > StackPanel > TextBlock">
             <Setter Property="Foreground" Value="White"/>
@@ -86,6 +92,32 @@
             <Setter Property="HorizontalAlignment" Value="Center"/>
             <Setter Property="VerticalAlignment" Value="Center"/>
         </Style>
+
+        <!-- Legend Button styles for clickable legend items -->
+        <Style Selector="Button.LegendButton">
+            <Setter Property="Width" Value="120"/>
+            <Setter Property="Height" Value="30"/>
+            <Setter Property="Margin" Value="5"/>
+            <Setter Property="CornerRadius" Value="4"/>
+            <Setter Property="FontWeight" Value="Bold"/>
+            <Setter Property="FontSize" Value="11"/>
+            <Setter Property="Foreground" Value="White"/>
+            <Setter Property="BorderThickness" Value="2"/>
+            <Setter Property="BorderBrush" Value="Transparent"/>
+            <Setter Property="HorizontalContentAlignment" Value="Center"/>
+            <Setter Property="VerticalContentAlignment" Value="Center"/>
+        </Style>
+        
+        <!-- Highlighted legend button style -->
+        <Style Selector="Button.LegendButton.Highlighted">
+            <Setter Property="BorderBrush" Value="Yellow"/>
+            <Setter Property="BorderThickness" Value="3"/>
+        </Style>
+        
+        <!-- Legend button hover effect -->
+        <Style Selector="Button.LegendButton:pointerover">
+            <Setter Property="Opacity" Value="0.8"/>
+        </Style>
     </UserControl.Styles>
 
     <UserControl.Resources>
@@ -100,47 +132,52 @@
             <RowDefinition Height="Auto"/>
         </Grid.RowDefinitions>
 
-        <!-- Legend - ohne dunklen Hintergrund -->
+        <!-- Legend - jetzt mit klickbaren Buttons -->
         <WrapPanel Grid.Row="0" 
+                   Name="LegendPanel"
                    HorizontalAlignment="Center" 
                    Orientation="Horizontal">
             
-            <!-- Farben aus SeriesToColorConverter verwenden -->
+            <!-- Farben aus SeriesToColorConverter verwenden - jetzt als Buttons -->
-            <Border Classes="LegendItem" Background="#6c3b01">
+            <Button Classes="LegendButton" Background="#6c3b01" 
-                <TextBlock Text="Alkalimetalle"/>
+                    Content="Alkalimetalle" Click="LegendButton_Click" 
-            </Border>
+                    Tag="Alkalimetall"/>
             
-            <Border Classes="LegendItem" Background="#846011">
+            <Button Classes="LegendButton" Background="#846011" 
-                <TextBlock Text="Erdalkalimetalle"/>
+                    Content="Erdalkalimetalle" Click="LegendButton_Click" 
-            </Border>
+                    Tag="Erdalkalimetall"/>
             
-            <Border Classes="LegendItem" Background="#402c17">
+            <Button Classes="LegendButton" Background="#402c17" 
-                <TextBlock Text="Lanthanoide"/>
+                    Content="Lanthanoide" Click="LegendButton_Click" 
-            </Border>
+                    Tag="Lanthanoid"/>
             
-            <Border Classes="LegendItem" Background="#732e4c">
+            <Button Classes="LegendButton" Background="#732e4c" 
-                <TextBlock Text="Actinoide"/>
+                    Content="Actinoide" Click="LegendButton_Click" 
-            </Border>
+                    Tag="Actinoid"/>
             
-            <Border Classes="LegendItem" Background="#711019">
+            <Button Classes="LegendButton" Background="#711019" 
-                <TextBlock Text="Übergangsmetalle"/>
+                    Content="Übergangsmetalle" Click="LegendButton_Click" 
-            </Border>
+                    Tag="Metall"/>
             
-            <Border Classes="LegendItem" Background="#555555">
+            <Button Classes="LegendButton" Background="#555555" 
-                <TextBlock Text="Post-Übergang"/>
+                    Content="Post-Übergang" Click="LegendButton_Click" 
-            </Border>
+                    Tag="Post-Übergangsmetall"/>
             
-            <Border Classes="LegendItem" Background="#015146">
+            <Button Classes="LegendButton" Background="#015146" 
-                <TextBlock Text="Halbmetalle"/>
+                    Content="Halbmetalle" Click="LegendButton_Click" 
-            </Border>
+                    Tag="Halbmetall"/>
             
-            <Border Classes="LegendItem" Background="#3e6418">
+            <Button Classes="LegendButton" Background="#3e6418" 
-                <TextBlock Text="Nichtmetalle"/>
+                    Content="Nichtmetalle" Click="LegendButton_Click" 
-            </Border>
+                    Tag="Nichtmetall"/>
             
-            <Border Classes="LegendItem" Background="#3a2151">
+            <Button Classes="LegendButton" Background="#3a2151" 
-                <TextBlock Text="Edelgase"/>
+                    Content="Edelgase" Click="LegendButton_Click" 
-            </Border>
+                    Tag="Edelgas"/>
+            
+            <Button Classes="LegendButton" Background="#846011" 
+                    Content="Halogene" Click="LegendButton_Click" 
+                    Tag="Halogen"/>
             
         </WrapPanel>
 

Project_Periodensystem.View/PeriodicTablePage.axaml.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
 using Avalonia;
@@ -20,6 +21,11 @@ namespace Project_Periodensystem.View
         private readonly Grid? periodicGrid;
         private PeriodensystemController? _controller;
         
+        // Für Highlighting-Funktionalität
+        private string? _currentHighlightedSeries;
+        private readonly List<Button> _elementButtons = new List<Button>();
+        private readonly List<Button> _legendButtons = new List<Button>();
+
         /// <summary>
         /// Konstruktor - initialisiert UI (Controller wird per SetController gesetzt)
         /// </summary>
@@ -90,6 +96,9 @@ namespace Project_Periodensystem.View
                 }
 
                 Logger.Log($"{successCount} von {elements.Count} Elementen erfolgreich geladen");
+                
+                // Legend-Buttons sammeln für Highlighting-Funktionalität
+                CollectLegendButtons();
             }
             catch (Exception ex)
             {
@@ -113,6 +122,10 @@ namespace Project_Periodensystem.View
             var button = new Button { Classes = { "ElementTile" } };
             var panel = new StackPanel();
 
+            // Button-Referenz für Highlighting speichern
+            button.Tag = element; // Element-Daten im Tag speichern
+            _elementButtons.Add(button);
+
             // Hintergrundfarbe über Converter setzen
             var backgroundColor = new SeriesToColorConverter()
                 .Convert(element.Series, typeof(Brush), null, CultureInfo.InvariantCulture) as Brush;
@@ -255,5 +268,158 @@ namespace Project_Periodensystem.View
                 Logger.LogException(ex, "ExportButton_Click");
             }
         }
+
+        /// <summary>
+        /// Event-Handler für Legende-Buttons - Highlighting-Funktionalität
+        /// </summary>
+        private void LegendButton_Click(object? sender, RoutedEventArgs e)
+        {
+            try
+            {
+                if (sender is not Button legendButton || legendButton.Tag?.ToString() is not string series)
+                {
+                    Logger.LogError("LegendButton_Click: Ungültiger Button oder Tag");
+                    return;
+                }
+
+                // Prüfen ob diese Serie bereits highlighted ist
+                if (_currentHighlightedSeries == series)
+                {
+                    // Highlighting entfernen
+                    ClearHighlighting();
+                    Logger.Log($"Highlighting für {series} entfernt");
+                }
+                else
+                {
+                    // Neue Serie highlighten
+                    HighlightSeries(series);
+                    Logger.Log($"Serie {series} wird highlighted");
+                }
+            }
+            catch (Exception ex)
+            {
+                Logger.LogException(ex, "LegendButton_Click");
+            }
+        }
+
+        /// <summary>
+        /// Hebt eine bestimmte Elementserie hervor
+        /// </summary>
+        private void HighlightSeries(string series)
+        {
+            try
+            {
+                // Zuerst alle Highlights entfernen
+                ClearHighlighting();
+
+                // Neue Serie als aktuell highlighted setzen
+                _currentHighlightedSeries = series;
+
+                // Element-Buttons highlighten, die zur Serie gehören
+                foreach (var button in _elementButtons)
+                {
+                    if (button.Tag is Element element && element.Series == series)
+                    {
+                        button.Classes.Add("Highlighted");
+                    }
+                }
+
+                // Legend-Button highlighten
+                var legendButton = GetLegendButtonForSeries(series);
+                if (legendButton != null)
+                {
+                    legendButton.Classes.Add("Highlighted");
+                }
+
+                Logger.Log($"Highlighting für Serie '{series}' angewendet");
+            }
+            catch (Exception ex)
+            {
+                Logger.LogException(ex, "HighlightSeries");
+            }
+        }
+
+        /// <summary>
+        /// Entfernt alle Highlighting-Effekte
+        /// </summary>
+        private void ClearHighlighting()
+        {
+            try
+            {
+                _currentHighlightedSeries = null;
+
+                // Highlighting von allen Element-Buttons entfernen
+                foreach (var button in _elementButtons)
+                {
+                    button.Classes.Remove("Highlighted");
+                }
+
+                // Highlighting von allen Legend-Buttons entfernen
+                foreach (var button in _legendButtons)
+                {
+                    button.Classes.Remove("Highlighted");
+                }
+
+                Logger.Log("Alle Highlighting-Effekte entfernt");
+            }
+            catch (Exception ex)
+            {
+                Logger.LogException(ex, "ClearHighlighting");
+            }
+        }
+
+        /// <summary>
+        /// Findet den Legend-Button für eine bestimmte Serie
+        /// </summary>
+        private Button? GetLegendButtonForSeries(string series)
+        {
+            try
+            {
+                // Durchsuche alle Legend-Buttons
+                foreach (var button in _legendButtons)
+                {
+                    if (button.Tag?.ToString() == series)
+                    {
+                        return button;
+                    }
+                }
+                return null;
+            }
+            catch (Exception ex)
+            {
+                Logger.LogException(ex, "GetLegendButtonForSeries");
+                return null;
+            }
+        }
+
+        /// <summary>
+        /// Sammelt alle Legend-Button-Referenzen nach dem Laden der UI
+        /// </summary>
+        private void CollectLegendButtons()
+        {
+            try
+            {
+                _legendButtons.Clear();
+                
+                // Finde alle Buttons mit der Klasse "LegendButton" 
+                var legendPanel = this.FindControl<WrapPanel>("LegendPanel");
+                if (legendPanel != null)
+                {
+                    foreach (var child in legendPanel.Children)
+                    {
+                        if (child is Button button && button.Classes.Contains("LegendButton"))
+                        {
+                            _legendButtons.Add(button);
+                        }
+                    }
+                }
+                
+                Logger.Log($"{_legendButtons.Count} Legend-Buttons gefunden");
+            }
+            catch (Exception ex)
+            {
+                Logger.LogException(ex, "CollectLegendButtons");
+            }
+        }
     }
 }